docstr: Test default value for missing field in extra.
docstr_tok: ["Test","default","value","for","missing","field","in","extra","."]
code: def test_default_extra_field(self, value):
      """Test default value for missing field in extra."""
      extra_config = ConnectionExtraConfig(conn_type="slack", extra={})
      assert extra_config.get("arg_missing", default=value) == value
  
file_path: airflow/tests/providers/slack/utils/test_utils.py
imports: from __future__ import annotations
  import pytest
  from airflow.providers.slack.utils import ConnectionExtraConfig, parse_filename
label_desc: Use image node_id 3 for calling the TestConnectionExtra obj's underlying member method code with example usage: obj.test_default_extra_field(value) without return types